Multiple Choice
In the DNA double helix, what components form the “rungs” of the molecular ladder?
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7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
Which set correctly lists the four nitrogenous bases found in DNA?
A
Adenine, uracil, cytosine, and guanine
B
Adenine, thymine, cytosine, and uracil
C
Adenine, thymine, cytosine, and guanine
D
Ribose, phosphate, adenine, and guanine
Verified step by step guidance1
Recall that DNA is composed of four nitrogenous bases which are divided into two categories: purines and pyrimidines.
Identify the purines in DNA: adenine (A) and guanine (G).
Identify the pyrimidines in DNA: cytosine (C) and thymine (T).
Note that uracil (U) is found in RNA, not DNA, so any option containing uracil is incorrect for DNA bases.
Confirm that the correct set of nitrogenous bases in DNA is adenine, thymine, cytosine, and guanine.
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